<template>
  <div>
    <!--    面包屑区域-->
    <el-breadcrumb  separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item :to="{ path: '/goods' }">商品列表</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
<!--    卡片视图区域-->
    <el-card>
<!--      提示区域-->
      <el-alert
          title="添加商品信息"
          type="info"
          center
          show-icon
          :closable="false">
      </el-alert>
<!--      步骤条区域-->
      <el-steps
          :space="200"
          :active="parseInt(activeIndex)"
          finish-status="success"
          align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
<!--      tab栏区域-->
      <el-form
          :model="addForm"
          :rules="addFormRules"
          ref="addFormRef"
          label-width="100px"
          class="demo-ruleForm"
          label-position="top">
        <el-tabs
            :tab-position="'left'"
            v-model="activeIndex"
            :before-leave="beforeTabLeave"
            @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                  v-model="addForm.goods_cat"
                  :options="cateList"
                  :props="cateProps"
                  @change="handleChange">
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
<!--            渲染表单的item项-->
            <el-form-item
                :label="item.attr_name"
                :key="item.attr_id"
                v-for="item in manyTableData">
<!--              复选框组-->
              <el-checkbox-group v-model="item.attr_vals">
              <el-checkbox
                  :label="cb"
                  :key="i" v-for="(cb, i) in item.attr_vals"
                  border>
              </el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
                :label="item.attr_name"
                :key="item.attr_id"
                v-for="item in onlyTableData">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
<!--            action表示要上传到的API地址-->
            <el-upload
                :action="uploadUrl"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                list-type="picture"
                :on-success="handleSuccess"
                :headers="headerObj">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

<!--    图片预览-->
    <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>

<script>
  import cloneDeep from 'lodash/cloneDeep'
  export default {
    name: "Add",
    data() {
      return {
        activeIndex: 0,
        //添加商品的表单对象
        addForm: {
          goods_name: '',
          goods_price: 0,
          goods_weight: 0,
          goods_number: 0,
          //商品所属的分类数组
          goods_cat: [],
          //图片的数组
          pics: [],
          //商品的详情描述
          goods_introduce: '',
          attrs: []
        },
        addFormRules: {
          goods_name: [{
            required: true,
            message: '请输入商品名称',
            trigger: 'blur'
          }],
          goods_price: [{
            required: true,
            message: '请输入商品价格',
            trigger: 'blur'
          }],
          goods_weight: [{
            required: true,
            message: '请输入商品重量',
            trigger: 'blur'
          }],
          goods_number: [{
            required: true,
            message: '请输入商品数量',
            trigger: 'blur'
          }],
          goods_cat: [{
            required: true,
            message: '请选择商品分类',
            trigger: 'blur'
          }],
        },
        cateList: [],
        cateProps: {
          expandTrigger: 'hover' ,
          label: 'cat_name',
          value: 'cat_id',
          children: 'children'
        },
        //动态属性数据列表
        manyTableData: [],
        //静态属性数据列表
        onlyTableData: [],
        //上传图片的URL地址
        uploadUrl: 'http://111.229.67.82:8888.top:8888/api/private/v1/upload',
        //图片上传组件的headers请求头对象
        headerObj: {
          Authorization: window.sessionStorage.getItem('token')
        },
        previewPath: '',
        previewVisible: false
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      async getCateList() {
        const {data:res} = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品分类数据失败')
        }
        this.cateList = res.data
      },
      //级联选择器选项中变化，会触发这个函数
      handleChange() {
        if (this.addForm.goods_cat.length !== 3) {
          this.addForm.goods_cat = []
        }
      },
      beforeTabLeave(activeName,oldActiveName) {
        if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
          this.$message.error('请先选择商品分类')
          return false
        }
      },
      async tabClicked() {
        if (this.activeIndex === '1') {
          const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
            params: {sel: 'many'}
          })
          if (res.meta.status !== 200) {
            return this.$message.error('获取动态参数失败')
          }
        res.data.forEach(item => item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' '))
          this.manyTableData = res.data

        } else if (this.activeIndex === '2'){
          const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
            params: {sel: 'only'}
          })

          if (res.meta.status !== 200) {
            return this.$message.error('获取静态参数失败')
          }
          this.onlyTableData = res.data
        }
      },
      //处理图片预览效果
      handlePreview(file) {
        this.previewPath = file.response.data.url
        this.previewVisible = true
      },
      //处理移出图片的操作
      handleRemove(file) {
        //1.获取将要删除的图片的临时路径
        const filePath = file.response.data.tmp_path
        //2. 从pics数组中，找到这个图片对应的索引值
        const i = this.addForm.pics.findIndex(x => x.pic === filePath)
        //3.调用数组的splice方法，把图片信息对象从pics数组中移出
        this.addForm.pics.splice(i, 1)
      },
      //监听图片上传成功的事件
      handleSuccess(response) {
        //1.拼接得到一个图片信息对象
        const picInfo = { pic : response.data.tmp_path}
        //2.将图片信息对象，push到pics数组中
        this.addForm.pics.push(picInfo)
      },
      add() {
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) {
            return this.$message.error('请填写必要的表单项')
          }
          //执行添加的业务逻辑
          const form = cloneDeep(this.addForm)
          form.goods_cat = form.goods_cat.join(',')

          //处理动态参数
          this.manyTableData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals.join(' ')
            }
            this.addForm.attrs.push(newInfo)
          })
          //处理静态属性
          this.onlyTableData.forEach(item => {
            const newInfo = {
              attr_id: item.attr_id,
              attr_value: item.attr_vals
            }
            this.addForm.attrs.push(newInfo)
          })
          form.attrs = this.addForm.attrs

          //发起请求添加商品
          const {data:res} = await this.$http.post('goods',form)
          //商品名称，必须是唯一的
          if(res.meta.status !== 201) {
            return this.$message.error('添加商品失败！')
          }
          this.$message.success('添加商品成功！')
          await this.$router.push('/goods')
        })
      }
    },
    computed: {
      cateId() {
        if (this.addForm.goods_cat.length === 3) {
          return this.addForm.goods_cat[2]
        }
        return null
      }
    }
  }
</script>

<style lang="less" scoped>
  .el-checkbox {
    margin:0 5px 0 0 !important;
  }
  .previewImg {
    width: 100%;
  }
  .btnAdd {
    margin-top: 15px;
  }
</style>